#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pthread.h>
int ticket=100;
pthread_mutex_t mutex;
void *route(void* arg)
{
    char *id=(char*)arg;
    while(1)
    {
        // 在访问共享资源前加锁
        pthread_mutex_lock(&mutex);
        if(ticket>0)
        {
            usleep(1000);
            printf("%s sells ticket:%d\n",id,ticket);
            ticket--;
        }
        else
        {
            // 释放锁并跳出循环
            pthread_mutex_unlock(&mutex);
            break;
        }
        pthread_mutex_unlock(&mutex);
    }
}

int main()
{
   // 初始化互斥锁
    pthread_mutex_init(&mutex, NULL);
    pthread_t t1,t2,t3,t4;
    pthread_create(&t1,NULL,route,"thread 1");
    pthread_create(&t2,NULL,route,"thread 2");
    pthread_create(&t3,NULL,route,"thread 3");
    pthread_create(&t4,NULL,route,"thread 4");

    pthread_join(t1,NULL);
    pthread_join(t2,NULL);
    pthread_join(t3,NULL);
    pthread_join(t4,NULL);

    // 最后记得销毁互斥锁
    pthread_mutex_destroy(&mutex);
    return 0;
}